replace header guards with #pragma once

tools/dbbuilder/dbbuilder.h

@@ -22,8 +22,7 @@
 /**
  * @file
  */
-#ifndef DBBUILDER_H
-#define DBBUILDER_H
+#pragma once
 
 #include <string>
 #include <sstream>
@@ -58,4 +57,3 @@
 #include "messagelog.h"
 #include "liboamcpp.h"
 
-#endif //DBBUILDER_H

tools/dbbuilder/systemcatalog.h

@@ -20,8 +20,7 @@
 /**
  * @file
  */
-#ifndef SYSTEMCATALOG_H
-#define SYSTEMCATALOG_H
+#pragma once
 
 #include "writeengine.h"
 
@@ -38,4 +37,3 @@ private:
 
 
 
-#endif //SYSTEMCATLOG_H

tools/dbbuilder/tpchpopulate.h

@@ -22,8 +22,7 @@
 /**
  * @file
  */
-#ifndef TPCHPOPULATE_H
-#define TPCHPOPULATE_H
+#pragma once
 
 class TpchPopulate
 {
@@ -41,4 +40,3 @@ private:
 
 };
 
-#endif //TPCHPOPULATE_H

tools/dbbuilder/tpchschema.h

@@ -22,8 +22,7 @@
 /**
  * @file
  */
-#ifndef TPCHSCHEMA_H
-#define TPCHSCHEMA_H
+#pragma once
 
 class TpchSchema
 {
@@ -42,4 +41,3 @@ private:
     void createindex(std::string createText);
 };
 
-#endif //TPCHSCHEMA_H